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These tests run on waterfall builders, so they should run in the CQ.
They shouldn't be limited to Linux and CrOS trybots.

AppShell is only actively developed for Linux, but it's used elsewhere
for extension tests, so we should avoid regressions in AppShell-specific
code on all desktop bots.

Change-Id: I6a8de9bb9cb1a04756e66ba596abec1955a83a86
Reviewed-on: https://chromium-review.googlesource.com/950480Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542044}